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When a semiconductor is cooled down, its...

When a semiconductor is cooled down, its resistivity will ?

A

Increases.

B

Decreases.

C

Unchanged.

D

Zero

Text Solution

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The correct Answer is:
To solve the question regarding the behavior of a semiconductor's resistivity when cooled down, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Concept of Resistivity**: - Resistivity is a property of materials that quantifies how strongly they resist the flow of electric current. It is denoted by the symbol ρ (rho). 2. **Identify the Type of Material**: - The question specifically mentions a semiconductor. Semiconductors are materials that have electrical conductivity between that of conductors and insulators. 3. **Temperature Coefficient of Resistivity**: - Semiconductors have a negative temperature coefficient of resistivity. This means that as the temperature increases, the resistivity decreases. Conversely, when the temperature decreases, the resistivity increases. 4. **Cooling the Semiconductor**: - In the question, we are cooling down the semiconductor. Cooling means we are decreasing the temperature of the semiconductor. 5. **Effect of Cooling on Resistivity**: - Since we established that semiconductors have a negative temperature coefficient, cooling the semiconductor (decreasing the temperature) will lead to an increase in resistivity. 6. **Conclusion**: - Therefore, when a semiconductor is cooled down, its resistivity will increase. ### Final Answer: The resistivity of the semiconductor will **increase** when it is cooled down. ---
To solve the question regarding the behavior of a semiconductor's resistivity when cooled down, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Concept of Resistivity**: - Resistivity is a property of materials that quantifies how strongly they resist the flow of electric current. It is denoted by the symbol ρ (rho). 2. **Identify the Type of Material**: ...
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